Phylogeny of Selaginellaceae: There is value in morphology after all!

Weststrand, Stina; Korall, Petra

doi:10.3732/ajb.1600156

Cited by 83 publications

(218 citation statements)

References 66 publications

(278 reference statements)

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“…Circumscription sensu Jermy (). Monophyletic (Korall et al, ; Korall & Kenrick, ; Zhou et al, ; Weststrand & Korall, ). Six (Zhou & Zhang, ) or seven (Weststrand & Korall, ) subgenera can be recognized.…”

Section: Classificationmentioning

confidence: 99%

See 1 more Smart Citation

A community‐derived classification for extant lycophytes and ferns

2016

J of Sytematics Evolution

1,121

273

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Phylogeny has long informed pteridophyte classification. As our ability to infer evolutionary trees has improved, classifications aimed at recognizing natural groups have become increasingly predictive and stable. Here, we provide a modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community‐based approach. We use monophyly as the primary criterion for the recognition of taxa, but also aim to preserve existing taxa and circumscriptions that are both widely accepted and consistent with our understanding of pteridophyte phylogeny. In total, this classification treats an estimated 11 916 species in 337 genera, 51 families, 14 orders, and two classes. This classification is not intended as the final word on lycophyte and fern taxonomy, but rather a summary statement of current hypotheses, derived from the best available data and shaped by those most familiar with the plants in question. We hope that it will serve as a resource for those wanting references to the recent literature on pteridophyte phylogeny and classification, a framework for guiding future investigations, and a stimulus to further discourse.

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Section: Classificationmentioning

confidence: 99%

“…20 species. (Korall et al, 1999;Korall & Kenrick, 2004;Weststrand & Korall, 2016a). Six or seven (Weststrand & Korall, 2016b) subgenera can be recognized.…”

Section: Lateristachysmentioning

confidence: 99%

A community‐derived classification for extant lycophytes and ferns

2016

J of Sytematics Evolution

1,121

273

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“…Our phylogeny differs substantially in only a single clade composed of S. australiensis and S. sinensis , which is placed as the sister to the lineage of clades A and B (Fig. ) rather than inside subgenus Stachygynandrum in clade B to which Weststrand and Korall () assigned it. The positioning of these two species had been considered unreliable by Korall and Kenrick ().…”

Section: Methodsmentioning

confidence: 99%

“…The resulting tree (Figs. 2A and S1) largely retains the structure of the phylogenetic analyses of Korall and Kenrick (2002) and Weststrand and Korall (2016), in particular the division of most of the genus into major clades A and B and the named subgenera within them. Our phylogeny differs substantially in only a single clade composed of S. australiensis and S. sinensis, which is placed as the sister to the lineage of clades A and B (Fig.…”

Section: Phylogeny Of Selaginellamentioning

confidence: 99%

The adaptive value of heterospory: Evidence from Selaginella

Petersen

Burd

2018

Evolution

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Heterospory was a pivotal evolutionary innovation for land plants, but it has never been clear why it evolved. We used the geographic distributions of 114 species of the heterosporous lycophyte Selaginella to explore the functional ecology of microspore and megaspore size, traits that would be correlated with many aspects of a species' regeneration niche. We characterized habitats at a global scale using leaf area index (LAI), a measure of foliage density and thus shading, and net primary productivity (NPP), a measure of growth potential. Microspore size tends to decrease as habitat LAI and NPP increase, a trend that could be related to desiccation resistance or to filtration of wind-borne particles by leaf surfaces. Megaspore size tends to increase among species that inhabit regions of high LAI, but there is an important interaction with NPP. This geographical pattern suggests that larger megaspores provide an establishment advantage in shaded habitats, although in open habitats, where light is less limiting, higher productivity of the environment seems to give an advantage to species with smaller megaspores. These results support previous theoretical arguments that heterospory was originally an adaptation to the increasing height and density of Devonian vegetative canopies that accompanied the diversification of vascular plants with leaves.

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“…Information on the origin and identity of these two species was lost from the glasshouse records, and Selaginella species (totaling c. 700-800 world-wide; Zhou et al, 2016) are notoriously difficult to identify in the absence of information on their geographic origin. The Selaginella species sampled here span phylogenetic diversity within the family, covering six different clades as resolved in the phylogeny of Weststrand & Korall (2016), and include species with both dorsal and ventral rhizophores and a range of stele types (Korall & Kenrick, 2002, 2004Weststrand & Korall, 2016).…”

Section: Researchmentioning

confidence: 99%

Vascularization of the Selaginella rhizophore: anatomical fingerprints of polar auxin transport with implications for the deep fossil record

2017

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The Selaginella rhizophore is a unique and enigmatic organ whose homology with roots, shoots, or neither of the two remains unresolved. Nevertheless, rhizophore-like organs have been documented in several fossil lycophytes. Here we test the homology of these organs through comparisons with the architecture of rhizophore vascularization in Selaginella. We document rhizophore vascularization in nine Selaginella species using cleared whole-mounts and histological sectioning combined with three-dimensional reconstruction. Three patterns of rhizophore vascularization are present in Selaginella and each is comparable to those observed in rhizophore-like organs of fossil lycophytes. More compellingly, we found that all Selaginella species sampled exhibit tracheids that arc backward from the stem and side branch into the rhizophore base. This tracheid curvature is consistent with acropetal auxin transport previously documented in the rhizophore and is indicative of the redirection of basipetal auxin from the shoot into the rhizophore during development. The tracheid curvature observed in Selaginella rhizophores provides an anatomical fingerprint for the patterns of auxin flow that underpin rhizophore development. Similar tracheid geometry may be present and should be searched for in fossils to address rhizophore homology and the conservation of auxin-related developmental mechanisms from early stages of lycophyte evolution.

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Phylogeny of Selaginellaceae: There is value in morphology after all!

Cited by 83 publications

References 66 publications

A community‐derived classification for extant lycophytes and ferns

A community‐derived classification for extant lycophytes and ferns

The adaptive value of heterospory: Evidence from Selaginella

Vascularization of the Selaginella rhizophore: anatomical fingerprints of polar auxin transport with implications for the deep fossil record

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